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KA3845B
The KA3845B is an 8-pin PDIP current mode PWM controller capable of delivering up to 1A of output current, with the option for rail mounting
KA3845B
The KA3845B is an 8-pin PDIP current mode PWM controller capable of delivering up to 1A of output current, with the option for rail mounting
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Shipping & Payment
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Service & Packaging
Service & Packaging
About After Sales Service
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KA3845B DataSheet
Current price plan is under preparation. Please contact our customer service team for the latest pricing information. Thank you for your understanding and support!
Details
With its high-frequency capability of up to 500 kHz and compatibility with various transistor configurations, the KA3845B offers a wide range of possibilities for power supply implementations. Its wide operating temperature range and convenient 16-pin DIP package further enhance its appeal for designers seeking a robust and adaptable PWM controller solution
Key Features
- Internal Regulator Provides a Stable 5V Reference Voltage
- Output Drivers Capable of Sinking or Sourcing 200mA
- Low Start-Up Current (1mA Max)
- Adjustable Pulse-by-Pulse Current Limiting
- Automatic Feed-Forward Compensation
- Enable Input and Error Amplifier with Latch
Application
- Switch mode power supplies
- LED lighting systems
- Battery chargers
- DC-DC converters
- AC-DC converters
- Solar inverters
- Motor control systems
- Uninterruptible power supplies (UPS)
- Audio amplifiers
- Industrial control systems
Specifications
The followings are basic parameters of the part selected concerning the characteristics of the part and categories it belongs to.
| Part Life Cycle Code | Active | Reach Compliance Code | compliant |
| ECCN Code | EAR99 | HTS Code ! | 8542.39.00.01 |
| Date Of Intro | 2017-10-12 | Analog IC - Other Type | SWITCHING CONTROLLER |
| Control Mode | CURRENT-MODE | Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 25 V | Input Voltage-Min | 8.2 V |
| Input Voltage-Nom | 15 V | JESD-30 Code | R-PDIP-T8 |
| Length | 9.2 mm | Number of Functions | 1 |
| Number of Terminals | 8 | Operating Temperature-Max | 70 °C |
| Operating Temperature-Min | Output Current-Max | 1 A | |
| Package Body Material | PLASTIC/EPOXY | Package Code | DIP |
| Package Shape | RECTANGULAR | Package Style | IN-LINE |
| Seated Height-Max | 5.08 mm | Surface Mount ! | NO |
| Temperature Grade ! | COMMERCIAL | Terminal Form ! | THROUGH-HOLE |
| Terminal Pitch ! | 2.54 mm | Terminal Position | DUAL |
| Width | 7.62 mm | Manufacturer | onsemi |
| Product Category ! | Switching Controllers | RoHS | Details |
| Number of Outputs | 1 Output | Switching Frequency ! | 500 kHz |
| Duty Cycle - Max | 50 % | Output Current ! | 1 A |
| Minimum Operating Temperature | 0 C | Maximum Operating Temperature ! | + 70 C |
| Mounting Style | Through Hole | Package / Case | DIP-8 |
| Brand | onsemi / Fairchild | Fall Time | 35 ns |
| Operating Supply Current | 17 mA | Product Type ! | Switching Controllers |
| Rise Time ! | 45 ns | Factory Pack Quantity | 50 |
| Subcategory | PMIC - Power Management ICs | Type | Current Mode PWM Controllers |
| Part # Aliases | KA3845B_NL | Unit Weight | 0.032805 oz |
Datasheet PDF
Datasheets record the features, absolute maximum ratings, applications and more of the device, which benefit a lot as an overall guide to the specific application of the part.
FAQs
What is KA3845B?
The KA3845B is a PWM (Pulse Width Modulation) controller integrated circuit designed for power supply and motor control applications. It is commonly used in switch-mode power supplies, DC-DC converters, and motor speed control circuits.
How Does KA3845B Work?
The KA3845B works by generating pulse width modulated signals based on the input voltage and control signals. It regulates the output voltage or motor speed by dynamically adjusting the width of the pulses, providing efficient power transfer and precise motor control. The integrated circuit also includes protection features such as overcurrent and overvoltage protection for enhanced system reliability.
How Many Pins does KA3845B have and What are the Functions of the Pinout Configuration?
The KA3845B is housed in a 16-pin PDIP (Plastic Dual In-line Package) package. The pinout configuration includes:
- VREF: Reference voltage input for error amplifier.
- VCC: Power supply voltage pin.
- RT/CT: External resistor or capacitor connection for oscillator frequency setting.
- DIS: Output driver disable pin.
- COMP: Error amplifier output pin.
- CS: Current sense input pin.
- SD, GND: Shutdown and ground pins, respectively.
- OUTPUT: PWM output pin.
What are the Pros and Cons of KA3845B?
Pros:
- Wide Application Range: Suitable for various power supply and motor control applications.
- Efficient Power Conversion: Enables efficient power transfer in switch-mode power supplies.
- Protection Features: Includes overcurrent and overvoltage protection for enhanced system reliability.
- Simple External Circuitry: Requires minimal external components for basic operation.
- Cost-Effective: Provides cost-effective control for power supply and motor applications.
Cons:
- External Components: May require additional external components for specific application requirements.
- Noisy Operation: PWM controllers may introduce noise in some applications.
- Thermal Considerations: Requires thermal management for heat dissipation in high-power applications.
Are There Any Equivalents/Alternatives to KA3845B for Recommendation?
- The UC3845B from Texas Instruments is a direct alternative to the KA3845B.
- Alternatives to the KA3845B include the SG3525A from STMicroelectronics and the TL494 from Texas Instruments.
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